docs: def _setuintbe(self, uintbe, length=None):
          """Set the bitstring to a big-endian unsigned int interpretation."""
          if length is not None and length % 8 != 0:
              raise CreationError("Big-endian integers must be whole-byte. "
                                  "Length = {0} bits.", length)
          self._setuint(uintbe, length)